Ellipsograph



1. A. COHILL. BARREL PRESS.

APPLICATION FILED JUNE II. 1919.

1,373,055. Patented Mar. 29, 1921,

E E2 (James Q/u/rew 1 4 HAVY Q. R. CHOWDER, OF CHICAGO, ILLINOIS.

ELLITPSOGRAPH.

Application filed May 5, 1919.

To all whom it may concern.

Be it known that I, HAVY Q. R. Cnownnn,

a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Ellipsograph, ing is a specification.

The object of the present invention is to provide a device of the character named which shall be of improved construction and operation.

The invention is exemplified in the combination and arrangement of parts shown in the accompanying drawing and described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawingi F igure 1 is an elevation of an instrument forming a part of the present invention;

Fig. 2 is a combined pen and pencil for use in connection with the instrument shown in Fig. 1 in drawing ellipses;

Fig. 3 is a perspective view showing the manner in which the instruments shown in Figs. 1 and 2 are operated in drawing an ellipse;

Fig. 4 is a sectional view showing the spring spool for holding the cord which forms a part of the instrument shown. in Fig. 1; and

Fig. 5 is an enlarged detail showing a spring clip which forms a part of the invention.

It frequently occurs in the preparation of drawings of various kinds that it becomes necessary for the draftsman to describe ellipses, and in some kinds of work it is desirable that these ellipses be accurately drawn and that they conform to specified dimensions. The present invention provides an ellipsograph which, althoughsimplc and easy to adjust and operate, will accurately produce ellipses conforming to prescribed dimensions.

In Figs. 1 and 3 of the drawing, the numerals 10 and 11 designate the arms, re

ticular purpose of this invention. The arms 10 and 11 are pivoted together at 12 so that they are frictionally held in the various positions to which they may be opened. The' extremities of the arms 10 and 11. carry pointed extensions 13 and 14,1'espectively,

Specification of Letters Patent.

of which the follownaled a spool 20.

face, the cord 22 will extend rammed Mar. 29, 1921. Serial No. 294,895.

the extensions being pivoted to the ends of their arms at 15 and 16, respectively. p The pivot screws 15 and 16 are provided with wing nuts 17 and 18 which may be tightened to hold the extensions 13 and 14 in various angular positions of adjustment relative to the arms 10 and 11. The arm 11 is provided with a bracket 19 on which is jour- The spool 20 is provided with a spring 21. for rotating the spool to wind a cord 22 thereon. clearly in Fig. 5, a circumferential groove 2-3 is formed on the lower end of the extension 141, and the lower jaw of a spring clip 24 is pivoted in the groove thus formed. The upper jaw on the spring clip 24:, as shown in Fig. 3, is provided with an opening 25 through which the extension 14 loosely passes, and a smaller opening 26 near the outer end of the upper jaw permits the passage of the cord 22 therethrough. This arrangement brlngs a portion of the cord spring clip so that held by the clip.

of the spring clip 24 are small enough so that these parts are retained in place in the grooves surrounding their respective supports. The points on the extensions 13 and 14., below the ring 27 and spring clip 24, are of substantially the same length, so that when the pointed ends of the extensions are placed upon asheet of paper, or other surabove the surface and parallel therewith. 1

The drawing instrument shown in Fig. 2 is provided with a handle portion 28, one end of which carries a clip 29 for holding a short length of lead, or other drawing material. 30. The opposite end of the handle 28 is provided with drawing with ink, ing pen 31 are both provided with shoulders 32 which extend entirely around the rods 33 by which the drawing points are con nected with the handle 28. The drawing points 29 and 31 are made length to bring the shoulders 32 above the surface being operated upon equal to the height at which the cord 22 is held by thering 27 and the spring clip 24. a

at a height The upper ends of the extensions 13 and is secured to a flat 14. The openings through the ring 27 and the lower jaw a ruling pen 31 for The clip 29 and the rul- As shown more of a proper above the plate adapted for engagement by the article to be pressed when the plunger is moved upwardly, and means for raising and lowering the plunger comprising pipes communicating With the cylinder and disposed beneath the floor, one pipe serving to admit fluid under pressure and the other serving to exhaust the same, a check valve in the inlet pipe, control valves in both pipes, and means for operating the control 10 valve comprising a pedal pivoted on the floor, an arm carried by the valve stem, and

a rod passing through the floor and connected With the pedal and said arm.

JAMES ANDREXV COHILL.

- members, and means for means for holding pivotally mounted on each of said supporting members, means for holding said elongated members against pivotal movement on their supporting members, and a cord for guiding a line tracing instrument arranged to extend from one of said elongated members to the other, said cord having one end thereof attached to one of adjnstably securing the other end of said cord to the other of said pointed members. i

at. In combination, a pair of supporting members adjustable toward and away from one another, an elongated pointed member pivotally carried by each of said supporting members, means for indicating when said elongated members are arranged in parallel relation relative to one another, said elongated members in fixed position on said supporting members, and a cord connected with each of said elongated members adjacent the pointed end thereof for strument.

5. In. a drafting instrument, a pair of supporting members adjustable toward and way from one another, an elongated pointed member pivotally mounted on each of said supporting members, and an external shoulder on each of said elongated members arranged to cooperate with a straight edg for setting said elongated members in parallel relation relative to one another when said shoulders are brought into alinement with one another.

(3. In a drafting instrument, a pair of supporting members adjustable toward and away from one another, an elongated pointed member pivotally carried by each of said a pporting members, a shoulder connected with each of said elongated members for 00- operating with a straight edge to arrange said elongated members in parallel relation relative to one another, and means for holding said elongated members against pivotal movement on said supporting members, said elongated members having indicating marks thereon to assist in setting the points of said members at a predetermined distance from one another.

7. A drafting instrument comprising a pair of supporting members pi votaltv connected to one another at one end thereof, elongated pointed extensions pivot/ally carried on the free ends of said supporting members, T-heads on said extensions adjaguiding a line tracing insaid pointed cent the pivots thereof, said T-heads being arranged to provide shoulders for coiiperating with a straight edge to set said extensions in parallel relation relative to one another, means for holding said extensions against pivotal movement on said irig members, said T-heads having indicating marks thereon adjacent said shoulders to assist in setting the points of said extensions ata predetermined distance from one another, and a cord having opposite portions thereof connected with said extensions adjacent their pointed ends and arranged to guide a linetracing instrument held against said cord.

8. A drafting instrument comprising a pair of spaced members, a cordhaving one end thereof connected with one of said members, a spring clip connected with the other of said members and frictionally and resilient-ly engaging said cord to hold said cord in fixed position relative to said memher during a drafting operation but arranged to permit movementof said cord when suflicient force is applied thereto for adjustment of said cord.

9. A drafting instrument comprising a frame having spaced'members thereon, a cord for guiding a marker having one end thereof connected with one of said members, a spring clip for yieldingly holding said cord in connection with the other of said members, and a take-up device for holding the portion of said cord on the side of said spring clip away from the portion thereof which acts as a guide for said marker.

10. An ellipsograph comprising a pair of arms pivotally connected to one another at one end thereof, pointed members pivoted to the opposite ends of said arms, means for maintaining said pointed members in parallel relation to one another, a device pivotally mounted on one of said pointed members in spaced relation relative to the end thereof and arranged to swing about the axis of said pointed member, a cord connected with said pivoted device, a spring clip pivotally mounted on the other of said pointed members and arranged to frictionally engage said cord, and a spring take-up for holding excess portions of said cord.

In testimony whereof I have signed my name to this specification on this 1st day of May A. D. 1919.

HAVYQ. R. CHOWDER.

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